Box band stretching and sealing tool



Dec. 22, 1936.. Q Q R N 2 ,065,427

ox BAND STRETCHING AND SEALING TboL Filed Nov. 22, 19234 3 Sheets-Sheet 2 hwenior; CLflEENC'E 0. CQELSOA 3 Sheets-She'et 3 Filed Nov. 22, 1934 If) ,6- .Wm. M Z 9% 4 wc w 1 E a H M 6. a a w I Patented Dec. 22, 1936 UNITED STATES BOX BAND STRETCHING AND SEALING TOOL Clarence 0. Carlsii vsignor to The Ame East Cleveland, Ohio, asican Steel and Wire Company of New Jersey, a corporation of New Jersey Application November 22, 1934, Serial No. 754,327

2 Claims.

I This invention relates to fastening tools in general, and is particularly concerned with fastening tools for the ends of package strapping,*,one of the objects being to produce firmly strapped packages. Since a tool may include a mechanism capable of interfastening the ends of strapping with varying degrees of security dependent on the extent of its operation, another object is to 'assure reasonable fastening security. Other ob ects may be inferred.

A specific example of a tool embodying the features of the invention and adapted to hand strip or band strapping, is illustrated by the accompanying drawings, in which:

Figure Us a side view.

Figure 2 is a top view.

Figure 3 is a longitudinal section from the line III-III in Figure 2.

Figure 4 is a longitudinal section from IVIV in Figure 1'.

Figure 5 is a longitudinal section from the line V-V in Figure 1.

Figure 6 shows details on the side opposite to that shown by Figure 1.-

Figure 7 is a. cross section from the line VII VII in Figure 4.

Figure 8 shows a fastening element adapted for use with the tool.

Figure 9 is a' cross-section of the fastening re- 30 sulting from the use of this element.

Referring to these drawings:

The 'tool'includesa base 2 to which a side frame 3 is pivoted by way of a pin H which is subsequently described; A pinch block 4 is screwed in this base 2 and is held in any desired adjustment by means of a spring 5 which is insertable in the line any one of several radial slots 6 cut in the bottom face of this block 4. The surface of this block is checkered so as to grip the lower of two 0 overlapping ends of a box strapping and hold it securely, Two pinch wheels 1 are'disposed adjacent the pinch block 4, the faces of these wheels having teeth which engage the upper of the overlapping ends of-the'box strapping, the revolving of these wheels causing the end of the strapping to be pulled through the tool and thus tensioning ,the band. i

Placed between the wheels I and fastened thereto by pins 8 is a ratchet wheel 9. On each side of the wheels 1 is a link II! which rotates about a pin II on a sleeve l2; This sleeve also supports the wheelsq and 9. A link i3 is connected to the links ID by means of a pin M on which is also fastened a pawl IS. The link I3 is connected to a lever l6 by a pin I1.

is pivoted to the base 2 by a pin it. To insure thepawl I 5 engaging the teeth of the ratchet wheel 9, a spring I9 is arranged to bear against the back of the pawl 15, this spring being sup-- o ported by a pin 29. A stationary pawl 2| is The lever 16 supported by a pin 22 and is held in engagement with the ratchet wheel 9.by a spring 23. Downward movement of the lever l6 causes the pawl l5and the pinch wheels I to rotate about the pin I l, thereby tensioning the box strapping. The,

pinch wheels I must be so supported that they can be lowered to engage the box strapping while tensioning the same,'and also so they can beraised for removing the tool from the band after fastening is completed. To accomplish this, that portion of the pin II on which the pinch wheels 1 rotate is set off-center, so that by rotating the pin H the wheels I may be raised or lowered.

The mechanism which makes the fastening in gitudinal edges of the block 29 to allow projections 3| of the dies 26 to enter slots 32 of the sleeve 33, thusallowing the shearing'surfaces 21 of the dies 26 to engage the edges 34 of the box strapping 35 and shear this box strapping along the edges 3.6 of the slots 32. A plurality of recesses 31 are cut on the face 38 of the jaw 24 to receive the part of the box strapping 35 which has been bent down to a point below the surface 38. i The upper ends of the jaws 24 are connected to links 39 and 49 by pins 4|. --These links are fastened together at their other ends by a pin 42 which is-also fastened to a crosshead 43. This crosshead is fastened to a link 44 by a pin 45. The upper end of the link 44 is fastened to an operating lever 46 by a pin 41. This operating lever 46 is supported in the side frame 3 by a pin 48. The upper portion of the side frame 3 is formeclinto a U-shaped handle 49 in which the lever 46 is held when in its upper; position by a spring 50, the latter engaging a depressed portion 5| of the lever 46. This lever is shown indown position at the completion of a fastening operation. The jaws 24 are moved to an open position by, moving the lever 46 upward.

The tool is provided with a locking mechanism,

the fact that the further the lever 46 is thrown the greater will be the depth of shear and the more secure will be the interfastening eirect. The looking mechanism includes a lever 52 which is pivoted to the side frame 3 by a pin 53. A locking pin 54 is fastened to the lever 52 by a pin 55. The opposite end of the pin 54 is slidably held in a hole in the side'frame 3. A latch 56 is pivotally supported at the upper end of the lever 52 by a pin 51. This latch 56 is held yieldingly against a surface 58 by a spring 59. An adjustable stop pin 60 is provided to control the lower limit of travel of the lever 46. This pin 68 has a hole longitudinally through its center in which a slidable pin 6| rides. This'pin 6| works against a screw 63 fixed to the lever 52. When the lever 46 approaches its extreme lowei position a face 62 of the lever engages an end of pin 6i and causes the opposite end of this pin to engage the lever 52 so as to, in turn, cause the latch 56 to latch on the surface 58. With the latch 56 in this position the crosshead 43 can move up past the end of the locking pin 54. When the lever 46 approaches its extreme upper position, the surface 65 of this lever engages the latch 56 which is thus released from engagement with the surface 58, a spring 66 causing the locking pin 54 to rest against the crosshead 43. A cover may be provided for the, locking "mechanism.

The side frame 3 is connected to a link 61 by a pin 68. The opposite end of the link 61 is connected to a gear segment lever 69 by a pin 10. This gear segment lever 69 meshes with a gear segment Ii which, in turn, is fastened to the eccentric pin ll. Thus when the side frame 3 is rotated on the pin l I, this pin is caused to rotate, which; because the eccentric portion of the pin supports the pinch wheel 1, causes these rolls to be raised or lowered.

The operation of the toolis as follows:

A piece of box strapping is placed around a package with its ends overlapping. With the lever 46 in the top position, and the side frame 3 tipped back, the tool is placed over the box strapping, so that the overlapping ends of the strapping lie between the block 4 and the pinch wheels I. A sleeve 33 of the type shown in Figure 8 is placed in the opening I2 of the base 2 and over the overlapping ends of the box strapping. The side frame 3 is moved to a vertical position, which causes the :laws 24 to be lowered to a position where their ends are adjacent the sides of the sleeve 33, thus holding the box strapping in a central position between the jaws. By moving the side frame 3 to a vertical position, the pinch wheels I are caused to be lowered, thus causing these wheels and the pinch block 4 to tightly grip the strapping.

The next operation is the tensioning or the band. This is accomplished by an up and down movement of the lever [6, which causes the wheels I to rotate and pull the top end of the strapping past the lower end which is held in place by the block 4. The stationary pawl 2| holds the wheels 1 against rotation when the lever I6 is released. Y

Next the fastening is made by moving the lever 46 in a downward direction. As this lever 461s being moved downwardly the crosshead 43 comes to a position where its top'edge is below the pin 54. When this happens this pin 54 snaps behind the crosshead 43, thus preventing the lever 46 from being raised until the pin 54 is removed. Since the lever and crosshead must be'raised to separate the jaws 24, these elements being interconnected, the tool is locked tothe work by the pin 54. Furthermore, this prevents movement of the side frame 3 to release the pinch wheels I, so that the straps are locked in tension- By a further downward movement of the lever 46 the shearing surfaces 21 of the dies 26 are caused to engage the sides of the box strapping 34 and shear the same along the edges 36 and complete the fastening.

At the extreme lower position of the lever 46, the surface 62 of this lever engages the pin 6i which, in turn, engages the adjustable screw 63. A movement of this pin 6| in the direction of the lever 52 causes this lever to be rotated until the latch 56 latches on the surface 58. This causes the end of the pin 54 to be withdrawn from above the crosshead 43, and allows the lever 46 to be moved to its top position, thereby moving the jaws 24 to an open position. The side frame 3 is now rotated to a back position, which releases the pinch wheels 1 from engagement with the strapping and allows the tool to be removed.

Although a specific example or a tool is here disclosed in accordance with the patent statutes, it is to be understood that various changes may be made in the same without departing from the scope of the invention, as defined in the following claims.

I claim:

1. A tool including the combination of a base on the top of which overlapped ends of package strapping may be placed, mechanism for interi'astening said ends,' said mechanism being mounted to move toward and from said base, a toothed wheel mounted above said base to move toward and from the same so that it may engage or disengage the top one of said ends, means responsive to movement or said mechanism toward said base for eflecting movement of said wheel toward the same and to movement or said mechanism from said base for eflecting movement of said wheel from said base, means for revolving said wheel to move the top one or said ends when said wheel 'is engaged therewi r. and means for preventing movement of the bottom one 01' said ends when said top one is so moved.

2. A tool including the combination of a base on the top of which overlapped ends of package strapping may be placed, mechanism Ior interfastening said ends, said mechanism being mounted to move toward and from said base, a.

pin journaled above said base transversely respecting said ends, a toothed wheel carried by said pin, the portion or the latter carrying said wheel being set oil-center so that rotation of said pin moves said wheel toward and from said' base whereby it may engage and disengage the top one or said ends, a gear element fixed to said pin, a second gear element meshing with the first named one, a lever fixed to said second element, a connecting-rod arranged between said lever and said mechanism, the latter being pivoted to swing about said pin whereby its movement eflects rotation 01' the same through said connecting-rod, lever and gear elements, means for revolving said wheel to move the top' one of said ends when said wheel is engaged therewith and means for preventing movement oi. the bottom one or said ends when said top is moved by 70 said wheel. CLARENCE 0. CARIBQN. 

